<!DOCTYPE html>
<html lang="zh">
<head>
    <meta charset="UTF-8">
    <title>引入css代码</title>
    <!--页内引入-->

    <style type="text/css">
        div {
            /*
            width: 200px;
            height: 200px;  */
            border: 1px solid red
        }
    </style>


</head>
<body>
<div>我是div</div>
<div>我是div</div>
<div>我是div</div>
<span>我是span</span>

</body>
</html>